Fix -Wpointer-sign warning in sol-thread.c

This fixes a couple of compiler warnings in rw_common when calling
target_read_memory/target_write_memory due to the type of parameter
"buf" (char *) not matching what these function expect (gdb_byte *).

gdb/ChangeLog:

        * sol-thread.c (rw_common): Change type of parameter "buf"
        to "gdb_byte *".
        (ps_pdwrite, ps_ptwrite): Cast parameter "buf" in call to
        rw_common to "gdb_byte *" instead of "char *".
Fix date in some of my recent ChangeLog entries...
	PR binutils/15417
	* elflink.c (elf_link_add_object_symbols): Initialise 'idx' to
	zero.
Fix display of structures/bitfields in register description.

Add support for displaying structures and bitfields for registers when
executing "maint print c-tdesc". This command is also used when
converting the xml target description file into c file.

Example of the behaviour is given below reporting a snipet of the xml file
and a snippet of the c code generated.

XML file contains:
...
    <union id="vecint">
      <field name="v4" type="v4int8"/>
      <field name="v2" type="v2int16"/>
    </union>

    <struct id="struct1">
      <field name="v4" type="v4int8"/>
      <field name="v2" type="v2int16"/>
    </struct>

    <struct id="struct2" size="8">
      <field name="f1" start="0" end="34"/>
      <field name="f2" start="63" end="63"/>
    </struct>
...

Setting this xml file as target description file and
issuing the maintenance print c-tdesc the following output
is obtained:

  feature = tdesc_create_feature (result, "extra");
  field_type = tdesc_named_type (feature, "int8");
  tdesc_create_vector (feature, "v4int8", field_type, 4);

  field_type = tdesc_named_type (feature, "int16");
  tdesc_create_vector (feature, "v2int16", field_type, 2);

  type = tdesc_create_union (feature, "vecint");
  field_type = tdesc_named_type (feature, "v4int8");
  tdesc_add_field (type, "v4", field_type);
  field_type = tdesc_named_type (feature, "v2int16");
  tdesc_add_field (type, "v2", field_type);

C output is not supported type "struct1".

This is finally the issue.

2013-03-27  Walfred Tedeschi  <walfred.tedeschi@intel.com>

        * target-descriptions.c (maint_print_c_tdesc_cmd):
        Add case to parse structures as register types and
        bitfields.

testsuite/

	* gdb.xml/maint_print_struct.exp: New file.
	* gdb.xml/maint_print_struct.xml: New file.

Change-Id: I2e20b095d508319c80275e724a9452c7e2834067
Signed-off-by: Walfred Tedeschi <walfred.tedeschi@intel.com>
2013-04-30  Jan-Benedict Glaw  <jbglaw@lug-owl.de>

config/
	* picflag.m4: Merge from GCC.
	* dfp.m4: Ditto.
	* bootstrap-asan.mk: Ditto.
	* ChangeLog: Ditto.